#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int my_strlen(char arr[])
{
	int i = 0;
	int num = 0;
	for (i = 0; arr[i] != '\0'; i++)
	{
		num++;
	}
	return num;
}
int main()
{
	char arr[] = "abcdrf";
	int ret = my_strlen(arr);
	printf("%d", ret);
	return 0;
}